And by that I mean any piece of code, or an idea/algorithm presented in pseudo code, something which is very important and is almost art now. I intend to put up a few paintings and work on paper around my office which depict engineering, rather celebrate engineering. I want them to be not so commonplace like e=mc2 or anything too geeky, like 42. They be special, they be important and have earned the position of being almost sacred owing to their contribution to their field. So I want a representation of computer programing as well. Thanks for your time.

EDIT:After seeing a few initial responses I would like to mention that I am not looking for things which go on a t-shirt or mug, but huge framing on a wall. So anything funny/wicked/clever is not only not suitable, but I want it to be inspiring/celebrating. Not to say that I don't love the funny, but this time I want to focus on things serious.

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Computer Hardware Wall Chart -- To some this would be worth printing full-size at a shop. This high-resolution poster is complete and detailed, covering computer hardware from the 8086 to the Socket F, from DIPP (never heard of it!) to DDR3 memory, to hard disk storage, optical storage, ports, interfaces, buses, and power connectors!

History of Programming Languages -- O'Reilly has created a vector-based timeline of the "evolution" of programming languages. Now you only need a plotter to print this classic up to size.

PHP Security Poster (SektionEins) -- Click "Download PDF" just above the form. If you live in Germany, Austria, or Switzerland you can mail-order a free copy right there. The page states "we have stopped shipping the poster to countries outside of the DACH region (Germany, Austria, Switzerland) for free." It is not clear if you can pay them to send a poster outside the region or not.

Surely you want Agile art! - A frame around a collection of sticky notes and stories that you can assign story points, prioritize, and move tasks through each step until done. Bonus points if you include a Sharpie on a string for ad hoc editing.

Load a picture of yourself in IE6. Print screen and frame it. Give it to your grandkids to remind them that, no matter how difficult things get, they've got it easy compared to what you had to deal with.

the tall office building artistically considered is a link I want to add to the discussion as it is an essay which captures the thoughts and ideas of the man, Louis H. Sullivan, who coined the phrase, "Form follows function". I find it to be very relevant and specially the thoughts in it about halfway through the essay are a must read for any engineer. Thoughts which are true even hundred years since the essay, thoughts like,

The man who designs in the spirit and with the sense of responsibility to the generation he lives in must be no coward, no denier, no bookworm, no dilettante. He must live of his life and for his life in the fullest, most consummate sense. He must realize at once and with the grasp of inspiration that the problem of the tall office building is one of the most stupendous, one of the most magnificent opportunities that the Lord of Nature in His beneficence has ever offered to the proud spirit of man.

This is awfully simplistic, but how about the evolution of the increment operation, in a timeline of the major low and high level languages? For many people starting out learning a programming language, grokking the classic semantic of n = n + 1 is a big step forward. You could lay it out much like that well known image of the evolution of man, from earliest known to current day homo erectus. inc a, a = a + 1, a++ etc.

The earliest computers had fixed programs. The von Neumann architecture was the first model of a stored-program computer. Without it, you'd be a computer engineer, rather than a software engineer. Here's a picture of its schematic, excerpted from Wikipedia.